OK, only 4 days remain in my Kickstarter, and Joshua didn't object, so I'm going to go ahead and post this. Jerome, please delete this thread if it bothers you.
I am posting here because I know it's a crowd that enjoys online gaming. I develop Battlegrounds Gaming Engine
(aka BGE), a virtual tabletop program for boardgaming, along similar lines as ZunTzu, but commercially-sold rather than free, and one that is still being actively developed and supported.
At the moment, I have made BGE free for anyone to use, fully unlocked, in case they want to "test drive" the program and perhaps try their hand at making their own game conversion (ie, modules) with it.
There's a video tutorial
that walks you through the entire process of porting a game to BGE. The process is really quite simple, and BGE should prove to be an empowering toolkit. Familiarity with image editing apps is a plus, but you'll never have to mess with scripting or XML editing, nor need to create spritemaps of your game components beforehand.
Should someone try it out and like the program enough to want to buy a license, there is currently a significant discount on the BGE license that comes with 7 free Player Slots (that many players can join and play with just the free BGE Demo). It's available during this Kickstarter campaign
for just $17 (regularly $30). Just be aware that the campaign ends in 4 days.
If you've got a favorite ZunTzu (or even Vassal) module you'd like to port to BGE, you can generally just rename the module file to be a ".zip", open the archive, and extract the component images to place in the corresponding BGE folder. There may be occasional exceptions, as I believe some modules are encrypted to prevent this.
PS: Although Mac support was initially available for BGE, changes to Mac OS X in recent years mean my software is no longer Mac-compatible (unless you're one of the few holdouts still running a pre-Lion version of OS X). So BGE is now Windows-only until v2 can be developed, which will be fully Mac compatible and Intel-native.